Problem Definition

The current jql variables allow searching approvals and approvers as described in this document.
JIRA however does not store the values of which users that have approved or declined a request.
The pending and pendingBy("") option only allows for issues to be displayed that still require approval, or still require approval by a defined set of users, though it is not possible to display the users themself as a function of the issues.
Doing so would allow for reporting on this field to be put in place, as well as extend the possibilities within the issue navigator to see the actual approval status of a request

Suggested Solution

Store approvers, decliners and pending approvers in a searchable field.